Light-emitting device

Abstract

A light-emitting device (1) for quality inspection comprises: a solid-state light-emitting element (10) having an excitation light emission surface (13) that emits excitation light; a phosphor ceramic layer (20) that is disposed on the excitation light emission surface (13), converts the excitation light into fluorescence, and has an excitation light incidence surface (21) on which the excitation light is incident, a fluorescence emission surface (22) from which light including the fluorescence is emitted, and a side surface (23); and a sealing resin (30) disposed so as to surround at least a portion of the side surface (23) of the phosphor ceramic layer (20). The light-emitting device (1) emits output light including fluorescence. The phosphor ceramic layer (20) includes a phosphor in which a transition metal element is at least activated. The thickness of the phosphor ceramic layer (20) is 60-560 μm. The wavelength at which the intensity of the spectrum of the fluorescence is at its maximum is 780 nm or above.

Claims

1. A light-emitting device comprising: a solid-state light-emitting element having an excitation light-emitting surface for emitting excitation light; a phosphor ceramic layer disposed on the excitation light-emitting surface and converting the excitation light into fluorescence, having an excitation light-incident surface on which the excitation light is incident, a fluorescence-emitting surface from which light containing the fluorescence is emitted, and a side surface; and a sealing resin disposed to surround at least a portion of the side surface of the phosphor ceramic layer, wherein the light-emitting device emits output light containing the fluorescence, the phosphor ceramic layer contains a phosphor in which at least a transition metal element is activated, the thickness of the phosphor ceramic layer is 60 μm or more and 560 μm or less, and the wavelength at which the intensity of the fluorescence spectrum is maximum is 780 nm or more, for quality inspection.

2. The phosphor ceramic layer is made of the compound LiGa ５ O ８ The light-emitting device according to claim 1, comprising a compound having the same crystal structure as the above, wherein the thickness of the phosphor ceramic layer is 60 μm or more and 300 μm or less.

3. The phosphor ceramic layer is compound β-Ga ２ O ３ The light-emitting device according to claim 1, comprising a compound having the same crystal structure as the above, wherein the thickness of the phosphor ceramic layer is 90 μm or more and 300 μm or less.

4. A light-emitting device according to any one of claims 1 to 3, for use in food inspection.

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